Machinery and propulsion

The machinery was a so-called CODOG (Combination Of Diesel Or Gas) machinery
comprising:

2 Pratt & Whitney marine gas turbines type GG4A-3 - a
maritime version of the Pratt & Whitney jet engine type J75
used in i.a. Loockheed U2, F105 Thunderchief and the passenger
planes Boeing 707 and DC 8. The maximum output of each turbine was
22,000 AHK. The gas turbines were used at speeds in excess of 15
knots and could give a speed of more than 30 knots (app. 55 km/h).
They consumed 11 tons of fuel per hour, and the total supply of
fuel was 440 tons.

2 16-cylinders single acting, turbocharged 2-stroke General
Motors diesel engines, type 16-567D. Normal output from each main
engine was 2,400 BHK at 800 rev/min of the propellers. Max speed
when using diesels was 15 knots (app. 28 km/h).

Via a large gear reducing the revolutions from 5,000 to 330
rev/min each engine was coupled to a propeller shaft. At the end of
each shaft a 3 m diameter propeller was mounted. Each propeller had
three 900 kg bronze blades with hydraulically variable pitch. The
diesel engines and the gas turbines worked together in such a way
that when gas turbines were required for high speed, the diesel
engines automatically coupled out to stop or idle. On the bridge
and in the control room a handle hydraulically adjusted the pitch
of the propeller.

The frigate needed a lot of electricity for turning the gun
turrets, the Sea Sparrow launcher and its general consumption. This
electricity was provided by five Frichs diesel generators each
giving an output of 375 KW (app. 420 KVA) at 3 x 450 V, 60 Hz.